The Secretary may pay the expenses (other than membership fees) of persons described in sections 7306 and 7401(1) of this title (including persons in positions described in
section 7401(1) of this title who are appointed on a temporary full-time basis or a part-time basis under
section 7405 of this title) who are detailed by the Under Secretary for Health to attend meetings of associations for the promotion of medical and related science.